Mycorrhiza pp 595-614 | Cite as

Interactions of Azoarcus sp. with Rhizosphere Fungi

  • Th. Hurek
  • B. Reinhold-Hurek
Chapter

Abstract

The rhizosphere was originally defined by Hiltner (1904) to be the zone of bacterial growth stimulated around the roots of legumes by nitrogenous compounds released from nodules. This definition has been broadened, and today also the regions of the root itself are recognized as components of the rhizosphere. Since the review of Starkey (1929), it has been well documented that roots of many plants have a pronounced influence on the microflora in the soil, changing it quantitatively and qualitatively. This so-called rhizosphere effect has been expressed as a numerical value, the R/S ratio (Katznelson 1946), representing the number of culturable microbes in the rhizosphere divided by their number in the soil. It has been shown to be dependent on the plant (see, e.g. Rouatt and Katznelson 1961) as well as on methods of its assessment (Rovira and Davey 1974). For example, for crop plants, R/S values usually lie between 2 and 20, but ratios exceeding 100 have been reported (Curl and Truelove 1986). Similar values were obtained when the relative enrichments of distinct bacterial populations in comparison to total counts of the microflora were compared in root and soil fractions (Watanabe and Barraquio 1979; Thomas-Bauzon et al. 1982; McClung et al. 1983). R/S values of fungi are usually 10–100 times lower than those of bacteria (Katznelson 1960).

Keywords

Arbuscular Mycorrhizal Rice Root Syst Bacteriol Strain BH72 Root Interior 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Th. Hurek
    • 1
  • B. Reinhold-Hurek
    • 1
  1. 1.Max Planck Institut für terrestrische MikrobiologieAG SymbioseMarburgGermany

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